The oxalo herbicides on the market are mostly amide herbicides, and are mostly soil treatment agents, which are mainly applied before the plant is sown. Effective control of annual grass weeds is good, and the control effect of broadleaf weeds is poor. In general, the control effect of acetochlor> metolachlor = isopropyl chloramine> butachlor> alachlor> alachlor.
Acetochlor: Duration of 40 to 70 days. Mainly in the soil layer of 0 ~ 3cm, high temperature, high humidity or low temperature after drug, low temperature, high humidity prone to phytotoxicity, but under normal circumstances can return to normal after 10 to 15 days. 24 to 72 hours after sowing is easy to produce phytotoxicity. The main site of weeds absorption is buds, so it must be applied before the weeds are unearthed.
Metolachlor: The potency period is 30 to 35 days, and the activity naturally disappears 10 to 12 weeks after application. Monocotyledonous grass weeds are mainly absorbed by the budding sheath. Dicotyledonous weeds are absorbed by young shoots and young roots, and they conduct upwards to suppress the growth of young shoots and fine roots. Sensitive weeds die before germination or just after emergence. . Grass weeds absorb more than broadleaf trees. It is appropriate to apply the pesticide 3 to 5 days before transplanting. It should be applied 1–2 days after field sowing, and the drug is easily degraded by soil microorganisms. The persistence period is moderate.
Alachlor: The time to control weeds is generally around 60 days. Can be absorbed by the soil, not easy to leaching, but also not volatile failure. Rice, sorghum, millet, cucumber, leeks, spinach crops are very sensitive to it. The depth of mixed soil should not exceed 5cm.
Protopine: The duration of validity in paddy fields is 30-50 days. When used alone, it can only be used for transplanting rice fields, and it will cause damage to seedlings when used in paddy field and direct seeding field. However, the addition of safeners can make up for deficiencies. When the application amount is too large, the leaves from the center of the seedlings, the tip of the seedlings to the edge of the leaves fade green, and the growth of the plants is inhibited.
Chloramine: The effective period is about 40 days. Cucumber is very sensitive to it and its safety is worse than butachlor. It should not be used in paddy field, direct seeding field, seedlings, weak seedlings and leaking Honda.
Napropamide: half-life up to 12 weeks. Pre-emergence or post-emergence 1-leaf application is effective. Gramineous wheat, Liliaceae leeks, Umbelliferae celery, fennel, lettuce are sensitive to it.
Propaganda: Used in paddy fields and quickly decomposes in soil. It is a highly selective contact herbicide that does not conduct. It acts only at the site of exposure and acts only as a stem and leaf treatment agent. Rice cannot be used within 10 days before and after spraying, it cannot be mixed with 2,4-D, nor can it be used with liquid fertilizers.
Chlorate: The effective period is about 60 days. After the application, keep the shallow water layer for 5 to 7 days, and do not drain the water. Suitable for mulching, irrigated plots, and summer crops, as well as the use of dry fields in the south, rice sprouts are very sensitive.
Butachlor: The residual period is about 60 days. Effective for germination and previous weeds at the 2-leaf stage. Putian used 3 days after sowing, and the herbicidal effect was good. Before or after the weeding effect was normal, the use of drugs in advance was prone to injury. Water can't drown the heart.
Propisochlor: The persistence period is 60-80 days, which is safe for the crops after the crop. It is not effective against perennial grasses and broad-leaved weeds. The drug is suitable for mulching, irrigated fields, and summer and southern dry fields. Rice sprouts are very sensitive.
Bifencarbamide: long residual period. It takes only one year after application to grow wheat, etc. It can only kill the pre-emergence weeds.
Phenyl ylamide: The retention period is more than 1 month and it is used in rice fields. For the effects of barnyardgrass, the rice should be applied 3 to 10 days after transplanting. The water-retaining layer should be 3 to 4 centimeters in diameter, and should not be applied during the rice seedling stage, especially in the seedling stage.
Phloxachlor: The half-life in soil is 16 to 20 weeks. It can control many kinds of weeds in wheat fields.
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